OpenPNM uses Semantic Versioning (i.e. X.Y.Z) to label releases. All major and minor versions (X.Y.z) are available on PyPI, but bugfix releases (x.y.Z) are not generally pushed unless the bug is important. Bugfix releases are available via download of the source code from Github.
OpenPNM uses the Github Flow system of Git branching, except instead of merging PRs into master, they are merged into a branch called dev. Any code added to dev is done via Pull Requests (PRs). When new PRs are merged into the dev branch, they are not given a new version number. Once enough new features have been added, the dev branch is merged into the master branch, and the minor release number (x.Y.z) will be incremented. An exception to this rule are bugfixes which may be found on master. In these cases a PR can be merged into master and the version number will be incremented (x.y.Z) to indicate the fix.
OpenPNM depends on several other packages widely known as the Scipy Stack. It is our policy to always support the latest version of all these packages and their dependencies.